Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Operations and Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Expenses [Abstract]
Total operating expenses	$ 15,761	$ 15,256	$ 14,485
Operating Loss	3,315	2,682	2,191
Other income and (deductions)
Interest Expense, net	(1,422)	(1,264)	(1,282)
Other, net	535	261	208
Total other income	(912)	(1,028)	(1,099)
Income taxes	349	38	(7)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,054	1,616	1,099
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	117	213	855
Net income (loss)	2,171	1,829	1,954
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic cost	(1)	(4)	(40)
Actuarial loss reclassified to periodic cost	42	223	190
Pension and non-pension postretirement benefit plan valuation adjustment	46	432	(357)
Unrealized (loss) gain on cash flow hedges	2	(1)	(3)
Other comprehensive income (loss)	89	650	(206)
Comprehensive Income	2,259	2,356	1,757
Corporate, Non-Segment [Member]
Operating Expenses [Abstract]
Operating and maintenance	25	(9)	(2)
Operating and maintenance from affiliates	4	14	10
Other	2	2	2
Total operating expenses	31	7	10
Operating Loss	(31)	(7)	(10)
Other income and (deductions)
Interest Expense, net	(413)	(333)	(378)
Equity in earnings of unconsolidated affiliates	2,450	1,908	1,482
Interest income from affiliates, net	5	0	1
Other, net	22	0	15
Total other income	2,064	1,575	1,120
Income before income taxes	2,033	1,568	1,110
Income taxes	(21)	(48)	11
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,054	1,616	1,099
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	116	90	864
Net income (loss)	2,170	1,706	1,963
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic cost	(1)	(4)	(40)
Actuarial loss reclassified to periodic cost	42	223	190
Pension and non-pension postretirement benefit plan valuation adjustment	46	431	(357)
Unrealized (loss) gain on cash flow hedges	2	0	(1)
Other comprehensive income (loss)	89	650	(208)
Comprehensive Income	$ 2,259	$ 2,356	$ 1,755